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  <title>预定义常量</title>

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 <h1>预定义常量</h1>

 <p class="simpara">下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。</p>
 <p class="para">
  <table class="doctable table">
   <caption><strong>System V message constants</strong></caption>
    
     <thead>
      <tr>
       <th>Constant</th>
       <th>Type</th>
       <th>Changelog</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>MSG_IPC_NOWAIT</td>
       <td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
       <td class="empty">&nbsp;</td>
      </tr>

      <tr>
        <td>MSG_EAGAIN</td>
        <td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
        <td>As of 5.2.0</td>
      </tr>

      <tr>
        <td>MSG_ENOMSG</td>
        <td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
        <td>As of 5.2.0</td>
      </tr>

      <tr>
        <td>MSG_NOERROR</td>
        <td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
        <td class="empty">&nbsp;</td>
      </tr>

      <tr>
       <td>MSG_EXCEPT</td>
       <td><span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span></td>
       <td class="empty">&nbsp;</td>
      </tr>

     </tbody>
    
  </table>

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